It used to be harder for me to express my gratitude. I would worry about using the wrong words. I never wanted to use the trite expressions that flit around day in and day out. I wanted my expression to really convey the sincerity I felt. I just didn't think that a simple "thank you" would fit the bill. How could it?
But, then I counted up how many times people told me thank you. I cross referenced these occurrences against my perception of the teller's insincerity. I compiled a list of the utterances that didn't make me feel loved or appreciated.
Every time I was thanked I was touched.
So, although it may seem small and banal to me in the telling, I'm pretty sure the hearer still understands my intent.
And, more to the point, the intent of expressing gratitude isn't to make me feel good about myself, now is it? So why should I care?